31 Ga Gallium

Click image to magnify. Ultrapure gallium, transition from liquid to solid (crystalline). Original size in cm: 1 x 2 and 1 x 4
Gallium is a soft, silvery metal, which is increasingly used in high tech industry. Notable here is gallium arsenide, an important semiconductor for special applications. Pure gallium already melts at 30°C (86°F). It is relatively safe to handle, but eye contact and longer skin contact should be avoided.

Solid gallium, fresh and after some time (2 months) at room temperature. The gallium spiral melted a bit and merged with another piece, which was stored in the same box.

Blue LEDs in front of a white painted wall. Those use gallium nitride or indium gallium nitride as semiconductor.